Vertical air-cooled pulverized coal burner capable of realizing continuous slag tapping

Abstract

The invention discloses a vertical air-cooled pulverized coal burner capable of realizing continuous slag tapping, comprising a secondary air pre-swirl chamber, an approximately cylinder-shaped burning chamber and a slag tapping chamber which are vertically communicated with each other in sequence, and a cooling air chamber. The invention is characterized in that the burner comprises an inlet end face arranged at the top end of the burning chamber and an outlet end face arranged on the side wall at the lower end of the burning chamber; fireproof thermal insulating layers are laid on the outer surfaces of the burning chamber and the slag tapping chamber and in the burner; thermal barriers are laid outside the fireproof thermal insulating layers; the internal cylinder wall and the outer cylinder wall of the burner are arranged outside the thermal barriers; a gap and the cooling air chamber are arranged between the internal cylinder wall and the outer cylinder wall; a certain number of heat-exchange fins are arranged in the cooling air chamber and on the surface of the internal cylinder wall; the burning chamber is divided into an upper cavity, a lower cavity and a molten slag confluence chamber from top to bottom in sequence; a secondary air inlet, a pulverized coal inlet and an ignition hole are all arranged on the inlet end face; a horizontal axial fire outlet communicated with the lower cavity is arranged on the outlet end face; the slag tapping chamber is vertically arranged at the bottom of the burner and comprises diffusion tubes and straight cylinder type tubes which are connected with each other; and a slag hole communicated with the molten slag confluence chamber is arranged at the upper ends of the diffusion tubes.

Description

technical field [0001] The invention relates to a pulverized coal burner, especially a vertical air-cooled pulverized coal burner capable of continuous liquid slag discharge, especially suitable for small and medium-sized industrial kilns requiring high temperature heat sources such as glass kilns, ceramic kilns, and refractory brick kilns. Furnaces and Boilers. Background technique [0002] Many pulverized coal liquid slagging cyclone technologies and burners used in industrial boilers and kilns, as described in patents CN86108138A, CN2051324U, CN2056960U, CN201043745Y, CN101324334A, the secondary air enters from the tangential or tangential direction of the combustion chamber. This method can easily lead to the distortion of the swirl flow field and temperature field in the combustion chamber, shorten the residence time of pulverized coal in the combustion chamber, reduce the centrifugal separation of ash and slag, and it is difficult to effectively improve the slag collec...

AI Technical Summary

Problems solved by technology

At present, the slag outlet of the pulverized coal liquid slag discharge burner for small and medium-sized industrial furnaces is generally set at the bottom of the burner body, and adopts a tapered or straight cylinder structure. The cooling of the environment leads to condensation, and the tapered or straight structure also causes the slag to adhere to the wall.

At present, measures such as enlarging the slag outlet are generally adopted, resulting in serious heat dissipation at the slag outlet, which in turn intensifies the tendency of the slag outlet to solidify

The problem of slag discharge is still the main reason why the current liquid slag discharge burner cannot operate stably for a long time, which seriously restricts the commercialization of the technology

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